Halozyme Therapeutics Releases Results of Enhanze Technology Clinical Trial to Improve the Subcutaneous Absorption of a Large Pr
January 22 2007 - 8:00AM
PR Newswire (US)
- Use of rHuPH20 Increases the Bioavailability of Subcutaneously
Injected Biologic Therapeutic Agent - SAN DIEGO, Jan. 22
/PRNewswire-FirstCall/ -- Halozyme Therapeutics, Inc. (AMEX:HTI), a
biopharmaceutical company developing and commercializing
recombinant human enzymes, today announced the results of a
clinical trial of Enhanze(TM) Technology intended to measure the
improved absorption and bioavailability of a representative
commercially-available large protein molecule therapeutic (LPMT).
Enhanze Technology is Halozyme's enzyme-based drug delivery
platform based on recombinant human PH20 hyaluronidase (rHuPH20).
This clinical trial compared the pharmacokinetics (PK), safety, and
tolerability of an LPMT agent subcutaneously injected first without
Enhanze Technology (rHuPH20) and then with rHuPH20 in 15 patients.
The open-label, dose escalation, within-patient controlled study
used escalating dose cohorts of rHuPH20 (ranging from 1,600 U to
12,800 U) and substituted a standard subcutaneous (SC) injection of
the LPMT with one SC injection of the LPMT agent combined with
Enhanze Technology (rHuPH20). The study compared the
bioavailability and other PK parameters, along with safety and
tolerability, of the two SC injections, one with and one without
Enhanze Technology (rHuPH20). The data from this clinical trial
support the study hypothesis that rHuPH20 increases the relative
bioavailability of the LPMT: * For the primary endpoint of area
under the curve (AUC) for plasma concentration of the LPMT, the AUC
over the 14 days following injection was higher when the LPMT was
administered with rHuPH20 compared to without rHuPH20 for 100%
(15/15) of the patients in the study. The addition of rHuPH20
increased the AUC above baseline (average trough level) of the LPMT
for all cohorts combined by an average of 58%. * The mean relative
AUC above baseline for LPMT with rHuPH20 compared to LPMT without
rHuPH20 was 136% for 1,600 U rHuPH20 (N=3), 178% for 3,200 U
rHuPH20 (N=3), 168% for 6,400 U rHuPH20 (N=3), and 150% for 12,800
U rHuPH20 (N=6). The study was not powered to statistically
distinguish a dose-dependent effect for rHuPH20 dose cohorts. * The
mean (for all cohorts combined) maximum concentration (Cmax) of
LPMT was increased by 26% when LPMT was co-administered with
rHuPH20, compared to LPMT without rHuPH20, and an increase in Cmax
was observed consistently across all rHuPH20 dose cohorts. * The
overall mean time to maximum plasma concentration (Tmax) of LPMT
was not meaningfully altered by co-administration with rHuPH20. *
Injection of rHuPH20 with the LPMT was well tolerated at all dose
levels, without dose-limiting toxicity, premature withdrawal, or
serious adverse events. * Of the five total adverse events reported
in this study, two were assessed as having no association with
either study drug (basal cell carcinoma and urinary tract
infection). The remaining three events consisted of injection site
erythema (redness) that occurred on the day of the injection of the
combination of LPMT with rHuPH20. Each event was mild in severity
and assessed as probably related to rHuPH20, and resolved within
one or two days. * Additional safety outcome parameters included
assessment of injection site pain, erythema, and edema. Patient
self-assessment of pain on a 0 to 100 mm scale averaged 27 mm on
the days of injection, with or without rHuPH20, and then decreased
on subsequent days. Investigator reporting of erythema mirrored
that for adverse events, as described above. There was no injection
site edema reported. As a spreading agent, hyaluronidase has
traditionally been used to accelerate the delivery of drugs and
fluids, including local anesthetics, other co-injected drugs, and
contrast agents, and for subcutaneous fluid replacement. Although a
large body of clinical experience supports the benefits and safety
of using hyaluronidase as an adjuvant to increase the absorption
and dispersion of co-injected small molecule drugs, to Halozyme's
knowledge clinical studies have not previously been performed to
support the benefits and safety of recombinant human hyaluronidase
use with large molecule agents, such as monoclonal antibodies and
other large molecule biologics. rHuPH20 is the first and only
FDA-approved hyaluronidase from recombinant human source. "The
findings from this first clinical trial of Enhanze Technology
provide proof of concept that rHuPH20 may also have clinical
application for large molecule therapeutics," said Richard C.
Yocum, MD, Vice President of Clinical Development and Medical
Affairs at Halozyme. "Additional studies with larger patient sample
sizes are warranted to further characterize the rHuPH20 effect,
especially with regard to optimal dose, and to investigate the role
that rHuPH20 may play in addressing unmet needs in the
administration of large molecule agents, thereby opening up new
areas of therapeutic indications." About Halozyme Therapeutics,
Inc. Halozyme is a biopharmaceutical company developing and
commercializing recombinant human enzymes for the drug delivery,
palliative care, oncology, and infertility markets. The company's
portfolio of products is based on intellectual property covering
the family of human enzymes known as hyaluronidases. The company's
Enhanze(TM) Technology is a novel drug delivery platform designed
to increase the absorption and dispersion of biologics. Its first
partnership is with Roche to apply Enhanze Technology to Roche's
biological therapeutic compounds for 13 targets. In addition, the
company has received FDA approval for two products: Cumulase(R) and
Hylenex, for use as an adjuvant to increase the absorption and
dispersion of other injected drugs and fluids. The Company also has
a number of different enzymes in its portfolio that are targeting
significant areas of unmet need. Safe Harbor Statement In addition
to historical information, the statements set forth above include
forward-looking statements (including, without limitation,
statements concerning clinical trial results and the applicability
of rHuPH20 to large protein molecule therapeutics) that involve
risk and uncertainties that could cause actual results to differ
materially from those in the forward-looking statements. The
forward-looking statements are also identified through use of the
words "believe," "enable," "may," "will," "could," "intends,"
"estimate," "anticipate," "plan," "predict," "probable,"
"potential," "possible," "should," "continue," and other words of
similar meaning. Actual results could differ materially from the
expectations contained in forward-looking statements as a result of
several factors, including regulatory approval requirements and
competitive conditions. These and other factors that may result in
differences are discussed in greater detail in the company's
reports on Forms 10-KSB, 10-Q, and other filings with the
Securities and Exchange Commission. Halozyme Contact Investor
Relations Contact David A. Ramsay Don Markley Chief Financial
Officer Lippert/Heilshorn & Associates (858) 794-8881 (310)
691-7100 Media Contacts Megan Swanland Riggs / Joleen Schultz
Mentus (858) 455-5500, x230/x215 DATASOURCE: Halozyme Therapeutics,
Inc. CONTACT: David A. Ramsay, Chief Financial Officer of Halozyme,
+1-858-794-8881, ; or Investor Relations, Don Markley of
Lippert/Heilshorn & Associates, +1-310-691-7100, , for
Halozyme; or Media, Megan Swanland Riggs, ext. 230, , or Joleen
Schultz, ext. 215, , both of Mentus, +1-858-455-5500, for Halozyme
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